Research with Bonobo Chimpanzees,dolphins,and Birds Has Shown That ____

 Research with Bonobo chimpanzees,dolphins,and birds has shown that ____. 

A) animals clearly have the ability to learn language
B) animals simply do not have the ability to learn language​
C) some animals are capable of learning communication elements that at least have the appearance of language​
D) animals having intellectual abilities that are more similar to those of humans can be taught language, but less intelligent species cannot benefit from language teaching​